Combined drill and stay-bolt cutter.



' P. FLEMING. COMBINED DRILL AND STAY BOLT CUTTER. APPLICATION FILED MAY 7,' 1908.

Patent-ed Nov.30, 1909.

, l F. FLBMING. COMBINED DRILL AND STAY BOLT CUTTER.

APPLmATIoN'rILED MA;- 7; 190s. l Y Patented Nov. 30, 1909.

l I o v 7 6 5 1 v1 L E 2N 4m v M M.

ANDREW, n. GRAHAM 004. Puma-umsamvxin. wAsHmGruN. n. c,

FRANK FLEMING, o nnoivrn, NEW YORK.

COMBINED DRILL AIVD STAY-BOLT CUTTER.

Y Application led May 7, 1908. Serial No. 431,404.

Specification of Letters Patent.

Patented Nov. 30, 1909.d

To all whom it may concern:

Be it known that I, FRANK FLEMING, of Rome, in the county of Oneida, in the State of New York, have invented new and useful Improvements in Combined Drills and Stay-Bolt Cutters, of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

This invention relates tocertain improvements in combined drill and stay bolt cutters of the class set forth in my Patent No. 869,628, dated October 29, 1907, upon Which my present device is an improvement, andv involves the use of a rotary threaded spindle which is adapted to be attached to any rotary power or hand-driven drill press or similar machine, capable of advancing and withdrawing the spindle to and from the work in combination with a nut engaging' the threaded portion of the spindle and a suitable cutting tool operable by the nut independently of and relatively to the spindle for the purpose ofcutting the stay bolts, tubes or flues of boilers and similar shells from the exterior where it is impracticable to perform a similar operation from the interior of the shell.

In addition to the broad object of providing a device applicable to the exterior of a shell for cutting stay bolts, tubes, and similar elements close to the interior of the shell as set forth in my .patent referred to:

My further Objectis to equip the same device with means for drilling the hole in the stay bolt from theV exterior inwardly and with additional' mechanism for estab-` lishing an automatic intermitting or 'con-` tinuous feed of the `stay bolt cutter into thev work under the control of the operator.

A further object is to provide the drill spindle with a removable drill point so that such point may be removed and` replacedwith a new one without necessitating the replacement of the entire drill.

Other objects and uses relating t'o specific parts of the. device will be brought out' in j' the following description.

In the drawings-j-Figure 1 isa central vertical sectional view of a combined drilland stay bolt cutter embodying the various features of my invention as shown in oper` ative position for cutting a Vstay bolt of'a boiler, portions of which are shown in sec-f tion. Figs. 2, 3, 4 and 5 are sectional views taken respectively on lines 2 2, 3 3, 1 -4,

and 5-5, Fig. 1, the' spindle being shown in elevation in Fig. 3. Figs. 6 and 7 are respectively an elevation and sectional view of the drill which is detachably secured to the drill spindle. Y

In Fig. 1 is shown a portion of a shell or boiler -1 and a portionof a stay bolt ,-2-. rigidly securedthereto and'provided with a socket 3 opening from the exterior of the shell' and formed by a drill twhich is detachablysecured to and rotates with a rotary spindle -5-, the upper end of said spindle being tapered and secured in a suitable chuck -6- of a drill press or other suitable device whereby the spindle -5- with the drillp-4- may be moved axially inopposite directions in the usual manner for drill presses.

A bearing collar 6-- is loosely mounted upon the lower end of the spindle -5- between suitable shoulders -7- and -8-, the shoulder -7-' being preferably integral with the spindle while the .shoulder -8- consists of a nut engaged with a threaded portion -9- of the spindle to hold the bearing collar -6- against undue upward movement. The collar -6- incloses and extends some distance below the flange -7- `for engaging the outer face of the boiler 1- around the adjacent face of the stay bolt -2- to limit the movement of the drill section -4- into the work or rather into the stay bolt -2- to determine the depth of the socket -3-. This drill section lis detachably secured to the lower end of the spindle --5- and for this purpose, said spindle is provided witha threaded socket -10- opening from its lower end while the drill section -.-4- is provided with a nipple -11- which is screwedv into the socket -10-, the portion of the drill section -4- just below the threaded nipple -11- being tapered to closely it a similar taper forming the lower end of the socket -10- thereby affording a broad bearing and tight fit between the drill section -4- and spindle -5- and at the same time permitting such drill section to be removed if desired.

By this construction I am enabled to use a comparatively short twist drill of just sufficient or slightly greater length than the socket -3- which it may be desired to drill in the stay bolt *2- but in practice I preferably provide the lower end of the drill section -4 with a removable drill point -12- consisting of a highly tempered or hardened metal plate which is snugly fitted in a transverse slot l3 extending upwardly from the lower end of the drill section 4l and of slightly less vertical length than the plate l2 so as to cause the lower end of said plate to protrude some distance beyond or below the lower end of the drill section in order to more effectively cut. into the work.

The object of making this drill point removable is to reduce the cost and labor of grinding or repairing the drill because by the use of the comparatively small drill point 12 it may be more perfectly tempered or hardened and is therefore bet- -ter adapted to withstand the strains to which it is subjected in forming the socket 3 In order that the plate l2 may be made as small as possible and still have ample bearings in the drill section lt I provide the opposite ends of the plate l2 with upwardly extending wings lewhich tit in corresponding grooves in the drill section 4 thereby affording greater resistance to twisting or bending of the plate and at the same time relieving the adjacent portion of the drill section from undue torsional strains.

As previously intimated the object of the collar or bearing 6 is to limit the degree of movement of the drill into the stay bolt and at the same time to steady the action of the drill when entering the work and for this purpose, said collar is loosely mounted between the shoulders 7 and 8 so that when frictionally engaged with the exterior of the shell 1 it may be held against rotation during the turning of the spindle 5 the nut 8 being adjusted so as to allow the spindle 5 to turn without turning the bearing collar 6 The threaded portion Q of the spin-k which engages the under side of the offset bolt cutter againstundue downward movement relative to thev This stay bolt cutter l8 is locked to rotate with the spindle 5 y and for this purpose constitutes what may which fits into a suitable.v 20 in one side of the' l7 and holds the stay collar l5 be termed a key lengthwise way spindle 5 as best seen in Fig. l, the upper tively of the adjacent portion of.

of the socket l portion of said cutter being comparastraight while its lower portion is curved downwardly and laterally through a curved slot or way 2l forming a continuation of the key way 20 and extending through the opposite side of the drill section -/l so that when the drill section has performed its work of drilling the socket 3 the cutter lS may be moved laterally in its ways 20 and 21 by the rotation of the nut l5 to cause the extreme lower end of the cutter l8 to cut its way through the adjacent portion of the stay bolt Q close to the inner side of the shell 1 The cutter 18 is prevented from undue upward movement relative to the collar 15 by contact with a horizontal annular flange 22 which is inserted in the upper end of the socket and is provided with a iin 23 which enters the key way 20 to lock the flange 2Q to rotate with the spindle 5 This iange 22 affords a broad bearing for the upper end or offset l7 of the cutter 1S and not only allows the latter to be deflected from its starting position while entering the work but is usually hardened to better resist end thrust against the too] when impelled downwardly through the stay bolt, said flange resting against a suitable washer M which in turn bears against the superposed reduced portion of the collar l5 forming the upper end of the socket l6 a similar hardened washer 25 being interposed between the bushing 19 and adjacent face of the offset '17 to reduce the friction and wear between the contacting parts.

rlhe threads Q of the spindle 5 are preferably of left hand pitch so that when the spindle is rotating from right to left as for drill spindles and the nut l5 is held by hand or otherwise against rotating therewith, said nut will be automatieally forced downwardly by the threads thereby feeding the cutting tool 1S downwardly and laterally while the .spindle with the cutter therein is rotatingl to gradually cut through the stay bolt justy within the shell 1 as shown by dotted lines in Fig. l.

The nut 15 is, therefore, rotatable or rather adapted to be held against rotation independently of the spindle 5- and cutting tool keyed thereto but when so held it is clearly cvident that it will be moved downwardly and may be returned to its normal up position by simply rotating it in the direction of rotation of the spindle but at a greater rate of speed or when the spindle has ceased rotation at the end of the cutting operation which may be brought about by stopping the machine at the end of the cutting operation.

It is desirable at times to provide for the intermitting automatic feed downwardly into the work and at other times it may be desired to make this feeding operation continuous instead of intermittlng and for this purpose a hand wheel -26- is loosely journaled upon a reduced upper portion of the nut or collar -15- and is held against endwise movement between a shoulder 27- integral with the collar -15- and a screw threaded collar or nut i 2S- which is screwed upon a threaded upper extremity of the collar -15- and engages the upper face of the hub of the hand wheel -26- as best seen in Figs. 1 and 3. The nut -28- is provided upon its periphery with ratchet teeth which are adapted to be engaged by a sliding pawl -30-, the latter being forced to its operative position by a suitable spring .-3l. i

A cam disk -32- 's loosely mounted upon the upper end of the ratchet collar -28- and is locked to and rotates with the spindle -5- by a key S3- which is seated in the key way 20- forming a continuation of the key waywhlch receives the tool -l8-, said cam disk having a reduced central portion loosely fitting within the upper portion. of the ratchet collar 28 and against the upper face of the collar` or nut dl5 whereit is held against upward displacement by separate langed lugs -34- which enter corresponding annular grooves -35- on the inner face of the ratchet collar -28- and allows the spindle with the cam disk -32- locked thereto to rotate when the collar -15 is `held against rota tion under` which conditions the collar l5- wheel 26-, vcam 3Q- together with the cutting tool n*18- are fed downwardly by the left hand screw thread -9-.

The pawl 30- consists of a radially movable plunger guided in a suitable hollow boss or frame -37-' which is 'rigid upon or integral with the hand wheel -26-, said pawl having its inner end provided with one or more teeth movable into and out `of mesh with the teeth of the ratchet wheel -28- while its outer end is reduced in diameter and is guided in a threaded bushing -38 which is screwed into the outer en of the hollow boss 37-.

rThe spring 31- is interposed between this bushing -38- and inner enlarged head of the pawl BO- and tends to force said pawl inwardly to engage its teeth with those of the ratchet -2S when not held outwardly against the action of the spring. This pawl 30.- is adapted to be drawn outwardly against the action of the spring --31- by means of a hand piece -39- which also serves as a `means for rotating the pawl -30- upon its aXis when its teeth are disengaged from those of the ratchet wheel #28. for a purpose hereinafter described. This pawl is provided on its inner end with a radial projecting stud 40 upon which is mounted an anti-friction roller 4lriding against the periphery of the cam disk -32- when adjusted to the position shown in Figs. l, 2, 4 and 5 for intermittingly feeding the cutting tool 18- downwardly into the stay bolt 2 when the hand wheel -26- is held against rotation and for this purpose the greater portion of the disk 32- is circular but is provided with one or more comparatively short cut outs or recesses -44-, the circular portion of the periphery of the disk -32-- riding against the roller bearing -41- operating to force the teeth of the pawl out of mesh with those of the ratchet wheel -28- but when the cut out -44- is registered with the roller -41, it allows the spring Blw to force the pawl inwardly to engage its teeth with those of the ratchet wheel -28 thereby temporarily locking the hand wheel -26- to the nut or collar -15- so that when the hand wheel 26- is held by hand against rotation in the manner previously described, the nut will also be held against rotation through a short interval or while the recess 411- is registered with the roller -40-, it being understood that at all other times the hand wheel is free and'may be easily held by the hand against rotation while the nut or collar -15- continues to rotate with the spindle -5 but does not effect any downward movement of the collar -15- except when such nut is held against rotation in the manner just pointed out.

During the drilling operation when it is simply necessary to rotate the spindle 5 without advancing the stay bolt cutter -18 into the work, it is desirable to rock the pawl -30- out of engagement with the ratchet wheel -38- and for this purpose the pawl with the stud 40- thereon may be drawn backwardly by the hand piece -39-- against the action of the spring 31 andvrotated about a quarter turn on its aXis to engage the roller stud -40- in a radial slot -46- in the frame 3T- at one side of the plunger or pawl -80- whereby said pawl is held against the action of the spring -Blm with its teeth out of engagement with the ratchet wheel 28- leaving the hand wheel free to be held against rotation to steady the action of the drill during the drilling operation.

1t is sometimes desirable to lock the hand wheel -26 to the ratchet wheel -28- so that by holding the wheel QG by hand againstrotation, the ratchet wheel will be held against such rotation and cause the threads -9- to feed the collar l5- and cutting tool 13- downwardly to cause the latter to cut through the stay bolt 2- and for this purpose 1 provide the hand wheel with an additional slot -50 of sufficient radial length to permit the roller --41-to be locked out of the plane of the cam *82* and into the slot *50* which is of suflicient radial length to permit the pawl *30* to be forced into engagement with the teeth of the ratchet wheel *28* whereupon the collar *15* will be locked to the hand wheel *26* so that by holding the hand wheel against rotation the collar or nut will be held thereby causing the threads *9* to feed the collar with the cutting tool *18* thereon downwardly while the spindle is being rotated downwardly to gradually cut radially through the stay bolt from the inside. During this cutting operation more or less ofthe chips tend to accumulate at the cutting edge of the tool *18*and in order that these chips may be properly removed and a suitable quantity of oil may be introduced at the cutting point, I provide the spindle *5* with a lengthwise passage *52* having its upper end terminating' in a lateral passage *53* and communicating with the interior of the cylinder cup *54* while its lower end is continued through the drill section terminating below the cutting tool *18* in a branch passage *55* extending radially through the drill section just above or in registration with the upper edge of the intermediate portion of the drill point *12* to allow oil and air to be forced through the passage *52* and on to the drill point and at the same time the branch passage *55* affords means for the entrance of a suitable drift tool whereby the drill point *12* may be loosened from its seat and removed from the drill section *4* when it is desired to remove it.

The cylinder cup *54* as best seen in Fig. 2 is provided with separate compartments *57* and -56*, one of which as the compartment *56* serves as an air chamber and is permanently connected to an air supply tube *58* which may be connected to any source of compressed air, not shown. This cylinder *54* is non-rota.- table and is provided with a central hub through which the shaft or spindle extends and is free. to rotate therein, said hub being` provided with diametr'ically opposite branch passages *59* and *60* communicating respectively with the air and oil compartments *56* and *57* and are located in the path of movement of the outer eX- tremity of the branch passage *53* so that as the spindle *5* is rotated this branch passage is alternately brought into communication with the air compartment *56* and oil compartment *57* through the branch passages *59* and *60*, respectively.

It is evident from the foregoing description that Vair will be forced through. the channel *52* and branch passage *55* during a part of the revolution of the spini dle while during the remaining part of suchA revolution, oil will be forced by gravity or otherwise through. the same passage and find exit at the cutting point of the tool *1S* and also at the drill points, the latter being provided with spiral grooves similar to thc ordinary twist drill which allow ample clearance for the collection of chips away from the drill point..

The cylinder *54* is closed at the top by a screw cap *G2* which is screwed upon a threaded upper portion of the central hub as best seen in Fig. 8 and forms practically air tight compartments for the air and oil and at the same time affords means for suppl'ying the air chamber *57* with oil.

The operation briefly described is as follows: Assuming that it is desired to cut or sever an ordinary stay bolt from the shellv in which it is secured, in which case the pawl *30* is drawn out of engagement with the ratchet wheel *28* and held in such position by turning the pawl so as to bring the roller bearing *41* into the slot -4G* of the frame *87* which holds the pawl in its adjusted position, then under such conditions the hand wheel *26* is free and may be held againstI rotation to steady the action of the drill. rlhe drill point is then brought against the outer end of the stay bolt and the drill spindle gradually de- `95 pressed in the usual manner for drill presses. This drilling operation is continued until the stop collar *G* engages the. outer face of the shell which limits the further movement of the drill inwardly. Having now drilled the hole to the proper depth in the outer end of the stay bolt, the pawl *30* is again .adjusted either to the position shown in Figs. 1, 2, 4 and 5 for intermitting feeding action or with the roller *41* into the slot *50* for continuous feeding. lVhen in the position shown in Figs. 1, 2, 4 and 5 for intermitting feeding action, the hand wheel *2G* is held against rotation being free from interlocking connection with the nut *15* while the circular portion of the cam disk *32* is in engagement with the roller 41* but as the recess *44* is registered with the roller *41* at each revolution of the disk by the spindle *1*, 115 the spring 31* forces the pawl into engagement with the ratchet thereby locking the wheel *2G* to the nut *15* which causes a slight temporary down feed of the cutting tool *18* at each revolution of 120 the spindle. If it is desired to make this feed continuous the roller *41* is thrown out of engagement with the cam *32 and into the slot *50* which allows the spring *31* to press the pawl 30 into engagement 125 with the ratchet wheel thereby establishing a. locking connection between the hand wheel 2G* and collar *15* and by holding the wheel *2G* by hand against rotation the collar *15* will be similarly held causing 130 these parts together with the tool -18- to feed downwardly continuously against the rotation of the spindle. Y

It is evident from the foregoing description that this device is particularly simple and affords means for expeditiously severing. the stay bolt from the shell to which it is,

cutter movable lengthwise in the slots and keying the drill to the spindle, and means for moving the cutter endwise.

3. In a machine for cutting stay bolts, a rotary spindle having a lengthwise slot in one side, a drill screwed to the spindle and having a lengthwise slot extending transversely therethrough and registered with the rst named slot, a cutter in said slots, and means for moving the cutter endwise.

4. In a machine for cutting stay bolts, a

rotary drill spindle, and a chambered member surrounding a portion of the spindle and provided with an air chamber and an oil chamber, said spindle having a lengthwise passage alternately communicating with said chambers as the spindle is rotated.

5. In a machine for cutting stay bolts, a rotary threaded spindle having a lengthwise groove, a drill secured to the spindle and having a transverse slot therethrough registered with said groove, a cutter in said groove and slot, a nut rotatable on the threaded portion `of the spindle androtatable independently thereof, and means actuated by the nut for moving the cutter endwise. Y

6. In a machine for cutting stay bolts, a rotary threaded spindle, a drill secured to the spindle and provided with a transverse slot therethrough, a cutter in the slot, and a nut rotatable on the threaded portion of the spindle and connected to said cutter for moving the latter endwise.

7. In a machine for cutting stay bolts, a rotary threaded spindle, a drill secured to the spindle and provided with a transverse slot therethrough, a cutter in the slot, a nut rotatable on the threaded portion ofthe spindle, connections between the nut and cutter for moving the cutter endwise asthe nut is rotated on the spindle, and means for holding the nut against rotation with the spindle.

8. In a machine for cutting stay bolts, a rotary threaded spindle, a drill secured to the spindle and provided with a transverse slot therethrough, a cutter in the slot, a nut rotatable on the threaded portion of the spindle, connections between the nut and cutter for moving the cutter endwise as the nut is rotated on the spindle, a handwheel loosely mounted on the nut, and means for locking the hand-wheel to the nut whereby the wheel and nut may be held by hand against rotation with the spindle.

9. In combination with a rotary threaded spindle, a cutter rotating with the spindle and movable transversely of its axis, a threaded collar engaging the threaded portion of the spindle, a hand piece loose on the collar, and means for locking and unlocking the hand piece to and from the collar.

10. In combination with a rotary'spindle having a transverse guide disposed at an angle with its axis, a cutting tool movable in said guide, a collar movable lengthwise of the spindle and engaged with said cutting tool for operating the same, means for imparting axial movement of the collar from the rotating spindle, a hand piece rotatable independently of the collar, and means for locking and unlocking the hand wheel to and from the collar.

1l. In combination with a rotary spindle, a cutter movable lengthwise and transversely of the spindle and rotating therewith, a threaded collar engaging the threaded portion of the spindle and connected to said cutter for moving the latter axially as the collar is rotated upon the spindle, a hand piece loosely mounted upon the collar to rotate independently thereof, a ratchet wheel secured to the collar, a pawl mounted upon the hand piece and movable into and out of engagement with the teeth of the ratchet wheel, and a cam rotating with the spindle independently of the collar for intermittently forcing the pawl out of engagementwith the ratchet wheel.

12. In combination with a rotary threaded spindle, a threaded collar engaging the threaded portion of the spindle and rotatable independently thereof, a cutter movable transversely of the spindle and actuated by said spindle, a hand piece loosely mounted upon the collar, means for locking the hand piece to the collar, and addition means rotating with the spindle for intermittently breaking the locking connection between the hand piece and collar.

13. In combination with a rotary threaded spindle, a threaded collar engaging the threaded portion of the spindle and rotatable independently thereof, a cutter movable transversely of the axis of the spindle and actuated by said collar, a toothed member secured to the collar, a hand piece rotatable with the spindle and collar but adapted to be held by hand against such rotation, a locking member on the hand piece movable into and out of engagement with the teeth of the toothed member, and means for holding the locking member out of engagement With the ratchet Wheel.

In witness whereof- I have hereunto set my hand this 2nd day of May 1908.

FRANK FLEBNG.

Vtnesses H. E. CHASE, C. M. MCCORMACK. 

